Software to debug PHP programs

Is there any free or commercial software which I could use to debug a php application step by step?
DistillingExpertsAsked:
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Greg AlexanderConnect With a Mentor Lead DeveloperCommented:
However a free and close comparison is NetBeans for php

http://netbeans.org/features/php/
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Greg AlexanderLead DeveloperCommented:
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DistillingExpertsAuthor Commented:
Thank you. Using NetBeans I am getting the following message:
Unable to connect
          Firefox can't establish a connection to the server at localhost.

I am using the following sample application as a test:
http://localhost/AirAlliance/index.php

What is wrong?
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Greg AlexanderLead DeveloperCommented:
That link was internal... so I can't see it... are you setting up a database connection?
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Lukasz ChmielewskiCommented:
http://www.eclipse.org/
You can use Zend debugger or XDebug with it.
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Ray PaseurCommented:
Firefox can't establish a connection to the server at localhost.

I don't think that is a PHP problem.
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